Free Unit Converter

Convert between common units of measurement like length, weight, and temperature.

Conversion

From

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How to use Free Unit Converter

Select the type of conversion (Length, Weight, etc.).

Enter the value you want to convert.

Choose your 'From' and 'To' units.

The result updates automatically.

Why use this tool?

Multi-Category

Convert Length, Weight, and Temperature in one place.

Instant

Real-time calculation as you type.

Mobile Friendly

Easy to use on phones and tablets.

Free Unit Converter - Convert Length, Weight, Temperature & More

Convert units instantly across 20+ categories including length, weight, temperature, volume, speed, area, and more. Accurate metric-imperial-US conversions for cooking, construction, science, and everyday use. All conversions happen instantly in your browser with mathematical precision. No signup, completely free.

Quick How-To Guide

1Select the category you need (length, weight, temperature, etc.)
2Enter your value in the "From" field
3Choose the unit you're converting from (meters, pounds, Celsius, etc.)
4Select the target unit you want to convert to
5See the converted result instantly with full precision

Why use our tool?

Comprehensive categories—20+ unit types including metric, imperial, and custom measurements

Instant conversion—results update as you type with zero delay

Bidirectional—convert in both directions simultaneously

High precision—accurate to 10 decimal places for scientific calculations

Common units highlighted—popular conversions appear first for quick access

100% offline capable—all conversions done client-side using pure math

Frequently Asked Questions

Find answers to common questions about using our tool, its features, and how it handles your data privacy.

Our conversions use standard, officially recognized conversion factors with precision to 10 decimal places. For example, 1 inch = 25.4mm exactly, 1 pound = 453.59237 grams, 0°C = 32°F. This precision is sufficient for all practical applications including scientific research, engineering, and medical calculations. Results are mathematically exact, not rounded approximations.

Yes! We support volume conversions for cooking including cups, tablespoons, teaspoons, fluid ounces, milliliters, and liters. Note: dry ingredient conversions (cups to grams) vary by ingredient density. A cup of flour (120g) weighs much less than a cup of sugar (200g). For weight-based baking accuracy, use a kitchen scale.

Our conversions are mathematically perfect. Discrepancies usually come from: (1) thermometer calibration errors; (2) rounding on the thermometer display; (3) ambient temperature affecting readings; (4) confusion between °F and °C. Remember: 0°C = 32°F (freezing), 100°C = 212°F (boiling). If converting body temperature, 37°C = 98.6°F.

Yes, completely free for personal and commercial use. Integrate unit conversions into your app, website, calculator, or educational materials without attribution, licensing fees, or usage restrictions. The mathematical formulas and conversion factors are public domain.

US and imperial (British) systems differ for volume measurements. US pints/gallons are smaller: 1 US gallon = 3.785 liters, but 1 imperial gallon = 4.546 liters (20% larger). For length and weight, they're essentially the same (1 yard, 1 pound). Always specify which system you're using for accurate conversions.

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